Hello Howard:
A very nice shot. I do not remember having seen these clouds ever. Just by the image it cannot be said how big or small they are. What lens did you use to photograph them? It seems that some wind was blowing up there.
regards
Jürgen

Hello:
A good composed picture. Probably darkening the sky (polarizer filter) would increase the contrast with the cloud and with the ground, because yellow and blue do a very nice contrast effect. 40°C is too much, but maybe with enough water in is not a problem for corn, which is a crop well adapted to humankind.
Greetings
Jürgen

Hi Isabelly:
This is the picture I like most from the three. I never thought these trees were good photographic subjects. Here you have managed to show the hard contrast of the leave-less tree against a bright sky. You have achieved a sort of moving effect from this viewing point.
Best Regards.
Jürgen

Hello Jan:
This is such a difficult picture to make. Normally shooting lightning storms when the sky is still slightly lit, rapidly overexposes the blue sky. So I would guess, your timing was clue in shooting this picture. Was this your only attempt? Did you get wet?
Greetings.

Hello Dario:
What a view in Sevilla. I never imagined that it is possible to have such heavy clouds in a place with a well-known dry weather. I have just found your picture browsing for more photos of Sevilla, after I uploaded mine. The river seems to be green all year round.
Regards
Jürgen

Hello Daniel:
Why crop your picture too much with that white frame? I think it would be better without it, and you could use all the 800 pixels fully.
I remember this place, with all its boats and yachts. Here you cought the traffic in the port nicely. Where you aboard a boat when you shot the picture?
Have a nice day. Jürgen

Hello Elzbieta:
A very good POV and, by the way, very good use of DOF. I think these flowers are more present in the fields in Spring and Summer than in Autum, and the date when you took the picture explains it very good. Is that wheat to the left of the picture? I think I can even spot an insect on those seeds.
Regards. Jürgen

Hi Craig:
I think this is a very simple picture, however, it transmits the message you want to give in the title. Here in Germany we also experience the 4 seasons. And right now the colours of the trees are much like those in the pictures --of course, only in the remaining hanging leaves, because most of them have fallen already.
A very well chosen perspective.
Regards.

Hello Delphine:
This makes me remember the Iguazú Waterfalls, although they have another height scale. However, in Iguazú I never saw anybody taking a bath, as seen here. Is the water in this river hat in summer?
Regarding your comment in my past picture, I may say that the photo exposure time is not what determines the lightning's wideness and brightness in the picture, and that is because the thunderbolt has such a short lifespan, that it can't be really controlled how it will be finally seen in the resulting picture. Compare this with the same picture (same settings) without the lightning here.
Best Regards.